X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/5a4def747897c1c6ffbe465506d846c7c686d3e9..99a132709e26342a376c5071d26dd87c40b04329:/Projects/XPLAINBridge/XPLAINBridge.c

diff --git a/Projects/XPLAINBridge/XPLAINBridge.c b/Projects/XPLAINBridge/XPLAINBridge.c
index 24aa383db..15cb87dc4 100644
--- a/Projects/XPLAINBridge/XPLAINBridge.c
+++ b/Projects/XPLAINBridge/XPLAINBridge.c
@@ -3,7 +3,7 @@
      Copyright (C) Dean Camera, 2010.
 
   dean [at] fourwalledcubicle [dot] com
-      www.fourwalledcubicle.com
+           www.lufa-lib.org
 */
 
 /*
@@ -119,15 +119,21 @@ void UARTBridge_Task(void)
 	if (USB_DeviceState != DEVICE_STATE_Configured)
 	  return;
 
-	/* Read bytes from the USB OUT endpoint into the UART transmit buffer */
-	int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
-	if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUART_Buffer)))
-	  RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
+	/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
+	if (!(RingBuffer_IsFull(&USBtoUART_Buffer)))
+	{
+		int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
 
+		/* Read bytes from the USB OUT endpoint into the UART transmit buffer */
+		if (!(ReceivedByte < 0))
+		  RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
+	}
+	
 	/* Check if the UART receive buffer flush timer has expired or buffer is nearly full */
 	RingBuff_Count_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
 	if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200))
 	{
+		/* Clear flush timer expiry flag */
 		TIFR0 |= (1 << TOV0);
 
 		/* Read bytes from the UART receive buffer into the USB IN endpoint */
@@ -206,8 +212,8 @@ void EVENT_USB_Device_ConfigurationChanged(void)
 	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 }
 
-/** Event handler for the library USB Unhandled Control Request event. */
-void EVENT_USB_Device_UnhandledControlRequest(void)
+/** Event handler for the library USB Control Request reception event. */
+void EVENT_USB_Device_ControlRequest(void)
 {
 	if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 	  CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);